System Firmware
---------------

The 'firmware' node under 'ibm,opal' lists system and OPAL firmware version.

firmware {
	symbol-map = <0x0 0x300ac650 0x0 0x1b3f5>;
	compatible = "ibm,opal-firmware";
	ml-version = [4d 4c 20 46 57 37 37 30 2e 32 30 20 46 57 37 37 30 2e 32 30 20 46 57 37 37 30 2e 32 30];
	mi-version = <0x4d49205a 0x4c373730 0x5f303735 0x205a4c37 0x37305f30 0x3735205a 0x4c373730 0x5f303735>;
	version = "skiboot-5.0-rc2";
	phandle = <0x8e>;
	linux,phandle = <0x8e>;
};

'compatible' property describes OPAL compatibility.

'symbol-map' property describes OPAL symbol start address and size.

'version' property describes OPAL version. Replaces 'git-id', so may
not be present. On POWER9 and above, it is always present.

'mi-version' property describes Microcode Image. Only on IBM FSP systems.
Will (likely) not be present on POWER9 systems.

'ml-version' property describes Microcode Level. Only on IBM FSP systems.
Will (likely) not be present on POWER9 systems.

MI/ML format:
 <ML/MI> <T side version> <P side version> <boot side version>
